You need to turn off the autocomplete,but jsf does not have an autocomplete attribute. So that means you have to turn it off on a per-input basis or write a custom renderer for the UIForm.
There's currently an open issue which requests to add this attribute to the : JSF spec issue 418. Currently, it's scheduled for JSF 2.2.
In the meanwhile, you can use OmniFaces Html5RenderKit to get support for autocomplete="off" on the component.